`body shape entered` signal called *multiple times* in the same frame, with the same shape

### Tested versions

- Reproducible in: v4.3.stable.mono.official [77dcf97d8]

### System information

Windows 10 - Vulkan (forward+) - dedicated

### Issue description

Sometimes the **body_shape_entered** signal is called **multiple times** in the same frame with the same shape.
When contact monitor enabled and max contact >= 2
Does not always happen.... but it is fairly consistent.
**I got a MRP setup that can reproduce this consistently in my machine**

Here's a print of the collision log:

This caught me by surprise.

In my use-case, all was working great with _body_entered_.... and then it all broke when I changed it to _body_shape_entered_.
I was doing some stuff when the collision happened where I extracted its shape and queue_freed the body.
So the second collision call broke the game due to the collision shape not being there anymore.

So this problem doesn't seem to happen with **body_entered**... only with **body_shape_entered**...
And yes, it is the same shape_index/local_shape_index.
And objects were single shapes too.

### Steps to reproduce

- Create a player rigidbody with contact monitor enabled and at least 2 contacts
- Connect body_shape_entered to player
Result: Collisions will occasionally happen multiple times a frame

MRP example:
- Run the MRP. Check prints for multiple collisions on the same object in the same frame.
- Uncomment line 18 and 19 to see it crash instead of only printing logs when it happened

### Minimal reproduction project (MRP)

[MRP_min-shape-twice.zip](https://github.com/user-attachments/files/17448145/MRP_min-shape-twice.zip)

Start by running MRP_min-shape-twice.zip with the reported Godot v4.3 stable build and inspect the body_shape_entered signal path used by a RigidBody3D with contact monitoring and at least two contacts. Compare the repeated same-frame callbacks with body_entered; done means the reproduction no longer emits duplicate callbacks for the same shape while valid distinct contacts still emit normally.

Written by the indexing model from the issue text.